After reinstalling gam tried to use "gam use project" but receving JWT signature error

Full steps to reproduce the issue:

1. Deleted old version by rm -rf ~/gam
2. Installed new by bash <(curl -s -S -L https://git.io/install-gam)
3. Tried to re-use previosly created project by gam use project

Expected outcome (what are you trying to do?): It will work as expected.

Actual outcome (what errors or bad behavior do you see instead?):

mrpsycho@DESKTOP-L6B9C6M:~/bin/gam$ gam user y.n check serviceaccount
Computer clock status:
 Your system time differs from admin.googleapis.com by less than 1 second   PASS
Service Account Private Key Authentication:
 Authenticating...invalid_grant: Invalid JWT Signature.                     FAIL

ERROR: Invalid private key in oauth2service.json. Please delete the file and then
recreate with "gam create project" or "gam use project"
mrpsycho@DESKTOP-L6B9C6M:~/bin/gam$ gam user [e-mail] check serviceaccount
Computer clock status:
 Your system time differs from admin.googleapis.com by less than 1 second   PASS
Service Account Private Key Authentication:
 Authenticating...invalid_grant: Invalid JWT Signature.                     FAIL

ERROR: Invalid private key in oauth2service.json. Please delete the file and then
recreate with "gam create project" or "gam use project"  

gam info domain works as expected.

[lonix86]

At the moment the only way is to regenerate a new JSON KEY from the project in GCP on the Service account, the key generated by the “create project” command is not working, if you make a diff with the old one you can see that a piece is missing

[lonix86]

thanks to you @jay0lee for your excellent work, GAM for me and a lot of people like me is just fantastic (I speak to you as a Google Partner and Reseller, with thousands of customers)