@Aran Billen,Thanks for posting in Q&A.
From your description, I know you want to check who has remove groups from configuration policies set in Intune.
Based on my testing, you can check audit logs in Intune to find who has removed groups from configuration policies set and set Filters to check logs 60 days ago.
Location: Microsoft Intune portal > Tenant administration > Audit logs.
Hope this can be helpful.
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.