PlayFabTitleId is null.

Imported Playfab sdk into unity, then I pasted titleid & secret key in the inspector.
when I hit play button or just click on any other option this titleid & secret key is getting empty.
When I hit the play button console shows titleid is null.
Tried re-installing unity,
I even tried with an empty new project too the same thing happens
Can someone help me out?

Thanks for reply,
ya secret key I was using that too still the same repeats even with secret key also, no difference at all @Captain_Pineapple