you might face with google analytics temporary errors which either doesn't allow login or taking too long loading reports. Below I have discussed a solution for a common google analytics error.
Google analytics login error
Sometimes a temporary error occurs and troubles to log into the analytics account. You can do the below things to fix this
Try using different browser
Try logging in from mobile app to verify if it is working
Clear Cache & cookies
Clear cache & cookies and try logging in
Restart your machine
Disconnect your internet for a while
Verify your google account
If you have not verified your google account, follow the instructions to verify and try logging in
Browser Extension may cause this issue
Use google chrome for logging into analytics account and make sure to remove any extensions that have conflicts with analytics(adblock, ublock etc).
Try using a proxy to verify if this is not related to IP issue.
Use the url https://analytics.google.com/analytics/web/
Google analytics login error is not a permanent error so nothing to worry about and if nothing works for you, ask from the google analytics support team.