Not sure what changed, but I'm no longer able to create or reply to posts.
This forum appears to be an issue:
https://powerusers.microsoft.com/t5/Power-Apps-Portals/bd-p/mpp_power_portals
I'm not able to view all of the error message, but here is what I grabbed from the page HTML.
<input placeholder="Sorry, either you cannot reply to this topic or you have not verified your email address by clicking on the verification link in the email we sent you when you registered. If you did not receive an email from us, or need us to resend it, please visit your User Profile page." disabled="disabled" class="lia-form-type-text lia-inline-topic-not-allowed" aria-label="Sorry, either you cannot reply to this topic or you have not verified your email address by clicking on the verification link in the email we sent you when you registered. If you did not receive an email from us, or need us to resend it, please visit your User Profile page.">
