I'm glad that you were able to resolve your issue and thank you for posting your solution so that others experiencing the same thing can easily reference this! Since the Microsoft Q&A community has a policy that "The question author cannot accept their own answer. They can only accept answers by others ", I'll repost your solution in case you'd like to accept the answer .
Issue:
- Azure Data Factory copy activity stuck on queued status using integration run time self-hosted
Solution:
- The issue occurred due to a change in the subscription of the resource group (possibly something in the validation process was not passing). After reinstalling the SHIR, everything looks to be functioning well.
If I missed anything please let me know and I'd be happy to add it to my answer, or feel free to comment below with any additional information.
Please remember to "Accept Answer" so that others in the community facing similar issues can easily find the solution.