Improve the message "we could not find the requested activity"

[margondicco]

A user shares an activity URL with another user (via an article, email, etc.) who is not a member of the space

When opening the link, a standard message is displayed that does not offer access to the space according to the access modalities.

This is a real pain point that results in numerous support tickets because users who share this link cannot understand the difference related to the URL structure and how the stream technically works

Request:

Suggest joining the space according to the access modalities

[plamarque]

if the space is secret (invite only+hidden), the suggested screen reveals its existence.

in other cases, yes.

[margondicco]

Hello indeed we should display the standard space access message according to the space properties