In macos it is for permissions, I solved it by following these two tutorials
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Enable root user
How to Enable the Root User on Mac - Make Tech Easier -
Execute Unity Hub as root user
3 formas de abrir aplicaciones con privilegios de raíz en una Mac.
BUT SHOW US HOW TO DELETE ALL PERSONAL FILES AND THEN U KNOW PLS SHOW US HOW IDK WHAT IM DOING
JUST SAY
Because standard users do not have permission to create folders in C:\ by default under Windows, or any other path that isn’t in the User’s home path.
This is what happens to security permissions when you create a folder in C:\ … specifically: you do not have modify & write permissions, that means this folder defaults to being read-only:
Try creating it in your user’s Documents folder, or any other folder under "C:\Users<your username>" where you have full permission.
Alternatively, but not recommended, create the folder using Explorer and set the appropriate permissions on that folder by enabling “Full Control”.
But beware!
Giving a standard user Full Control or even Write permissions to the root of a drive, specifically the one where Windows is installed (commonly C:), poses a serious security risk as it would make Windows and its applications very vulnerable to all sorts of attacks, including accidental or intentional deletion of entire files/folders!
it did not help
I have tried all solutions here and non of them works
someone please help me, I have the problem of “unable to create project”, I did everything they sent, user permissions, I don’t have onedrive, I reinstalled and reinstalled unity hub, put the license back, put the location of the folders projects and editor in a partition that I use for work. AND NOTHING WORKS
Try a location without any spaces or special characters.
The location has nothing special, nothing works 
The location path certainly has spaces in it, and we can‘t see the rest. Who knows, it may even be a very deep path that hits the Windows path length limit which is around 240-260 characters all in all.
Try creating a project in your user‘s home directory, for example under Documents. See if that works.
„Unable to create Project“ almost always points out a permission issue in the „Location“ field.
It matters a lot which „user permissions“ you set, where, for which user or group, and whether these permissions are inherited by subfolders, and what the permissions of the parent folders are. The only location that always works by default for any app and purposes is the user‘s home directory.
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Hello everyone, I found the solution to this problem, or at least it worked for me. I tried to do everything they said, the onedrive thing, folder location, etc. Looking for a solution I found that the location of the download of the editor, this location from what I see in the images that they send, they change it, and as a result it throws the error “unable to create project”. I don’t know how to explain it but the solution would be the following:
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Enter the %appdata% folder and delete 2 folders called Unity and Unity hub (this so that when we reinstall unity the configurations we did before are not saved, this way it would be like downloading unity for the first time).
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Once you delete those folders, we enter where we have unity installed and execute the file that says unistall.exe, after deleting it, we reinstall the unity hub again (when they do, they will see that unity appears until the animation that appears when they first enter).
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Once the reinstallation is done, go to the gear that is at the top right in the menu (the one that says preferences when you put the mouse over it), then go to the part that says installs and you will see 2 locations, one where the installations are and another where the downloads are, the installation one, which is the location where the editor is, they choose it when they reinstall unity. Now, the one that does matter to us is the one that says download location, that IS VERY IMPORTANT THAT YOU DO NOT TOUCH IT, leave it in the default location it has. A location that should look something like this when defaulted.
Now if you followed all the steps you should be able to create your projects without problem, this is how I fixed it and it worked for me. I hope it has served you and answer me if you have any questions.
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To clarify these settings:
Installs location => This is where the Unity Hub downloads the Unity Editor executables and related files.
Default: C:\Program Files\Unity\Hub\Editor
Permissions for logged in User:
Downloads location => This is the folder where files are stored during downloads.
Default: C:\Users\CodeSmile\AppData\Local\Temp
Permissions for logged in user:
Of course if you change either of these locations, the permissions of these locations can affect whether the Unity Hub can create projects respectively launch the editor.
It is recommended NOT to change either of these locations UNLESS you absolutely know what you are doing and you ABSOLUTELY have to make that change (ie running out of disk space).
Pretty sure you won’t have to re-install the Hub to make this work though. As long as the Hub itself is running fine you can change those two folder locations. If either one was the (only) issue, a re-install wasn’t exactly necessary - that is, if you know what these locations default to (hence I posted them above).
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better explained impossible, thanks for clarifying
Oh my god dude you saved my life xD Thank you very much
Hİ PLS HELP ME I CANT MAKE PROJECT PLS LOOK AT THIS AND IM IN MACBOOK AND IM TRYİNG TO MAKE A PROJECT AND UNİTY SAYS ‘‘Unable to create project’’ pls helpme
Hey! I just wanted to share that i had the same problem on my mac, but it turned out it was because I downloaded the wrong editor (I thought I downloaded silicon, but I had downloaded intel). Hope this helps 
Yes. I can’t create projects with 2022.3.7 . Hub doesn’t do anything.