Hide My Email address falsely claims to be deactivated or deleted when replying in Apple Mail

sassy monkey wrote:

The situation is I sent a message to a person using a long established and ACTIVE Hide My Mail (HMM) address. That person replied to my HMM address fine. Yet when I try to reply to them, their address in the To: field and my HMM address in the From: field are greyed out. If I try to send, Mac OS whines that it's unable to send and that the HMM address must be deactivated or deleted (see attached screenshot below).

When I go to iCloud.com to confirm the address is active, it shows that it is.

The same thing happens if I send a test message to my HMM address from a conventional address and then try to reply to it. The message goes through initially, but the reply to the HMM address fails in the same way.

What's worse is that it's stuck because there's no way to change the reply to address to a different mailbox. So this means that an important email to a company concerning a billing problem is locked out and now I have to copy/paste the thread in a new message from a different address which may cause problems with their automated system and not connect me to the specialist who is aware of my support issue.

Is there a work around or am I missing something obvious? This seems like a very bad ugly huge bug.

https://discussions.apple.com/content/attachment/7dc21a04-3223-41d0-bfa3-1445f4cfbe82

See if there is anything here:

What is Hide My Email? - Apple Support

Set up and use Hide My Email in iCloud+ on all your devices

if no insight or resolve you can Call Customer Support (800) MY–APPLE (800–692–7753)

I am seeing the same issue. So far, the only workarounds I've managed to find are as follows...

a. Save the e-mail as a DRAFT, close message. Go to DRAFT folder, open the e-mail, and send it.

b. Open, Reply, and Send the message through iCloud.com

If you wish to make Apple aware of your findings: Product Feedback - Apple