Hi @RandomisedRicochet ,
Welcome to our forum!
Singing out and starting a fresh citrix session usually resolves the issue (even if sessionhost is the same)
In order to further if the issue is related to the citrix environment, it's suggested that you could check if there're any differences between the two citrix session, just like running some third-party programs.
On the other hand, i notice that you have tried some troubleshooting steps, please run Outlook Diagnostics.
If it doesn't help, please to run SaRA Advanced Diagnostics:
- Click Outlook Advanced Diagnostics.
- Click Run when you are prompted by your browser.
If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.