Could not find any valid credentials to authenticate the target for type [Windows]

[Nosey]

I'm trying to run a discovery of a 200 Windows severs in an Azure Tenant

All servers are failing - the error I see in the logs is 2025-02-13T14:47:39.002+0000 DEBUG (Worker-Standard:PowershellProbe-fca93880fbbb5650ef0efa12beefdcf2) [ConnectionWrapper:69] connection validation error: com.snc.automation_common.integration.exceptions.AuthenticationFailedException - Could not find any valid credentials to authenticate the target for type [Windows]

I tried a "Quick Discovery" of several of the IP's and ran into no issues so built on that and ran some smaller discovery schedules

Test 1) Targeted 10 and  all 10 succeed

Test 2) Targeted 20 (including the 10 that were successful in the previous test)  all 20 succeed

Test 3) Targeted to 30 (including the 20 that were successful in the previous test) 

• 11 succeeded ,
• 12 failed in a "Identifying" phase
• 9 failed with  authentication issues

Test 4) Targeted to 40 (including the 30 that were successful in the previous test) 

All failed with error Could not find any valid credentials to authenticate the target for type [Windows]

Including the 30 that were successful in the previous test
I have tried:

 - Purging "Credential affinity records"
 - Changing the mid.shazzam.max_scanners_per_thread

I know the credential works because it works on small groups its just on scans over 20 it stops working

Any help would be great