Just to confirm: You have Signature 4 Selected when you registered the S3 Compatible storage account with Managed Backup? If so, Support is requesting you do the following as a test:

1. Download and Install CloudBerry Explorer: https://www.msp360.com/explorer.aspx
2. Add your S3 Compatible Account from File - Add New Account
3. Select Signature 4
4. Click the "Test Connection" button and send us a screenshot or text of the results of the test

So it looks like it will make the connection. It isn't until it tries to use a bucket or object for that matter that it tries to either not use a region or use one named by default on the backend of the API.

Here is what CloudBerry Explorer gives me. Please note its the same for an MSP360 Backup Service.




And then watching the back end of my systems with all the header information here is what I get as well. Notice how it says its expecting the region to be us-west-1 towards the bottoms. (Private Information has been redacted).




What do you guys think?

I just noticed under the API's Authorization header it is indeed forcing it to be us-east-1.

Let me send this over to the team for review.

Thanks David!

Unfortunately, what you're trying to do is unsupported. There's a feature request in the system, and I've added your comments and request. The feature has not been scheduled and at this time.