Protonmail / pm.me alias for multi-user
The Visionary plan offers multi-user support. However, for sub-users (not primary account user), any user alias is based on a custom domain only and not pm.me / protonmail is not available.
However, the primary account user can choose to create an alias for a custom domain, pm.me or protonmail.
That flexibility should be extended to the sub-users to provide the same anonymity options for sub-users, i.e., children or primary account owner.

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MC commented
I switched to Proton Business and have to add a user to the new organization and now I'm unable to add any more @pm.me email aliases to the user. Is there a way to remove this user and continue to add @pm.me email aliases?
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JWF commented
I am a Visionary user but I believe this could also affect Family users. I am the primary admin of my user group. I am able to assign @pm.me, @proton.me, and @protonmail.com aliases to my account. However, sub-users on my account are only able to assign aliases from my custom domain. They do not have a Proton username and their Proton login is tied to the custom domain email.
This is problematic, because the custom domain is a `.family` TLD, which is often not accepted as a valid email in many online forms and websites. This means my sub-users use Gmail accounts to forward emails to the Proton account. This is an unfortunate workaround.
I raised a ticket with customer support. They advised to create a new Proton account, migrate all data from the sub-user account to the new account, add the new user by their Proton username to my group, and then change the custom domain aliases from old account to new account.
I did this with one account, and it was a painful, manual process. I accidentally forgot to export the sub-user's contacts and permanently lost them. All email read/unread states were reset. It took the course of several days to use the Import/Export tool to download mailboxes from one account and upload them to another. All of this could have been avoided by allowing each sub-user to have a @pm.me / @proton.me / @protonmail.com alias.
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Joshua commented
Yes, I got a visionary plan, made sub-accounts for my family members so that we could all share it, but they cannot merge individual (free) protonmail addresses with the sub-accounts that I created for the paid plan. That means they end up with two separate accounts on protonmail, which is not very useful. I would like them each to have one account that allows them to send/receive from the proton.me address or the domain name of our paid account. I can currently do this because my account is the one that I initially created the custom domain in, but the others that are added as sub-accounts cannot.
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Glenn commented
I agree, it has been frustrating that this isn't a feature of any of the plans, especially the visionary plan.