Due to multiple security vulnerabilities, many companies, including AWS, have deprecated TLS 1.0 and TLS 1.1.
AWS Security Blog - TLS 1.2 to become the minimum TLS protocol level for all AWS API endpoints
This could lead to customers not being able to backup into a repository based on AWS S3 Bucket.
Veeam KB article was created to show the the error in VBR to help customers remediate this issue: https://www.veeam.com/kb4490