@Ole Sorensen Thanks for your patience on this.
Based on the shared information, I have reviewed the backend logs I can see that you have successfully created and deleted the devops pool "trusted-manxxedpool" and you are able to create the other pool "devops-xxxedpool" without any issues.
Initially the pool creation has been failed due to the authorization error.
{"statusMessage":"{\"status\":\"Failed\",\"error\":{\"code\":\"ResourceOperationFailure\",\"message\":\"The resource operation completed with terminal provisioning state 'Failed'.\",\"details\":[{\"message\":\"The request has been completed with result Failed. Please check details with more information.\",\"details\":[{\"code\":\"PoolProvisioningFailed\",\"message\":\"Failed to provision agent pool. Exception: The logged in user, , does not have Manage permissions in the Azure DevOps organization provided,
As mentioned in the documentation, you need to have either of the below permissions to create the devops pools.
Please be make sure you have any of the above permissions if not, reach out to your org admin get added and retry the operation.
Hope this helps, let me know if you have any further questions on this.