Confusing error ("you do not have permissions to invite") when inviting to unfederated room

[clokep]

Steps to reproduce

1. Create a room with federation turned off.
2. Attempt to invite someone from a different domain.
3. See a "you do not have permissions to invite" message.

Outcome

What did you expect?

A better error message: "You cannot invite users from other domains" (or something worded better than that).

What happened instead?

The message implies that there's a permissions problem that can be fixed, but this is not possible.

Operating system

macOS

Browser information

Firefox 101.0b6

URL for webapp

https://chat.mozilla.org

Application version

Unsure

Homeserver

mozilla.org

Will you send logs?

No

[clokep]

CC @Sancus

[turt2live]

The error comes from element in translating the M_FORBIDDEN error code.

[turt2live]

related: #22102

[t3chguy]

Duplicate of element-hq/element-meta#1466