I changed my account’s email address, and ran into the same problems as in this post. I am unable to confirm my email. I cannot comment, answer, or post on walls. I tried making a new account for troubleshooting, but it still didn’t work.
OK sounds like it's fixed now. Sorry for the trouble, my email provider changed my account to a free one because my credit card expired... but didn't tell me so I could add a new one. And the free account has a very low limit on emails that can be sent.