I’ve gotten the same e-mail today on my self-hosted forum.
I use Facebook, GitHub, Twitter, and Google logins. Today I received the “Action needed” e-mail telling me to be sure the sign-in button is compliant with the branding guidelines, and to reply to the e-mail when it is.
Is there something I can do locally, or is it best to wait for an update?
Edit: Sorry, missed @tshenry’s link. If anybody else missed it because they scroll too fast here it is:
I’ve added it to my default theme and hopefully it’s fine.