Hello, there are no issues with disabling the TLS 1.0 and TLS 1.1 protocols from the Veeam code perspective.
Network connections are established by an OS itself, which in turn always uses the highest TLS version supported by both the OS and the target host (there's a negotiation process). So the only thing disabling TLS 1.0 and TLS 1.1 can potentially break are network connections between hosts which do not support TLS 1.2 in the first place. For example, some older Windows OS versions without the TLS 1.2 patch installed.