Dear Harrison,
Welcome to the forum here.
From the description "On the right not shown in the screenshot, it said the problem is something with either the Assigned to or the Issue Logged by where Microsoft profiles are used.", the issue seems to be at the Assigned to Claims and Issue Logged by Claims side in your environment.
I noticed that you seem to use Assigned to in Assigned to Claims and Issue Logged by in Issue Logged by Claims in your environment. If yes, please use Assigned to Claims in Assigned to Claims and Issue Logged by Claims in Issue Logged by Claims, save the flow and then run the flow again to see the result.
Welcome to share any updates when you have time if you need further help on this issue.
Thanks for your effort and time!
Sincerely,
Cliff | Microsoft Community Moderator