The authorization mechanism you have provided is not supported. Please use AWS4-HMAC-SHA256.

Hi

See error message in title for accessing S3 buckets. What do I need to change?

Many thanks

[reply=“Timothy Addison;d2175”] AWS? Which Region?

My guess is you are using a new region that requires Signature version 4 - and you are using 2. To change this go to the Advanced Setting on the S3 Compatible storage account you set up in Backup and change the Signature to version 4.