Trying to email "contact-nnnn@toastmastersclubs.org" - Error message

I sent emails to the "contact-nnnn@toastmastersclubs.org" address at a few clubs (about upcoming speech contests).

I got this response for some of the emails (not all):
You do not have the right permissions to send an e-mail to this e-mail address (contact-1936@toastmastersclubs.org) from gibson.alj@gmail.com . Be sure your "From" address in your e-mail client is the same as your address in your toastmastersclubs.org member profile.

My "From" address is ok. I regularly send emails to "officers..." and "members..." at my own club.

What's happening? This email is supposed to be publicly accessible.
contact-4393266@toastmastersclubs.org
The contact e-mail list consists of the club contact(s) as entered by the administrator in this website. These are the same contacts who receive messages via the contact form. This email address is publicly accessible--anyone can send messages to this address. This is the address we suggest should be listed as the public contact address with Toastmasters International.

Issue first occurred this afternoon. Using Windows 10 (up to date), Chrome, cookies enabled.

Al Gibson
Club no 4393266

Clubs have to turn on the contact email address. If it does not work use their contact form.