Google Sign-in Grayed out

I use a android tablet and NetIO UI in my kitchen to control my home automation system. I added a new tab and address to my plex server (windows) from this tablet. Plex displays correctly in the webview, but the google sign-in is grayed out so I cannot log-in. I tried to create a second account to sign-in with a different e-mail, but after several seconds, it displays a message “There was an error signing in”. Why is my google sign-in grayed out and why can’t I sign-in with a different e-mail when I have that e-mail shared in settings?

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