there are some reports, mainly Suggestions, open with Atlassian.
Some information contradict each other:
Here is another one claiming that the portion of time he has to react is not documented anywhere making the process intransparent to them:
I believe the best way to double check would be to contact Atlassian support.
While doing so you also could ask for a Suggestion to be opened. Content could be asking for an option to configure the expiration time (like in JSDCLOUD-4521 with the difference that there it is stated that the invitations would never expire).
On October 20, 2021, Atlassian published a security advisory for Jira Service Management. The full advisory is available at this link. We've seen a number of questions already asking for...
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