With reference to vault v1.9.2, I have a question that do we have a list of all the supported versions of consul? I checked the documentation and release notes, but did not find that information. Please note that the consul is being used here only as a storage backend for the vault.
Vault 1.9.2 has an integrated storage option that can be used instead of Consul. Considering that you are using Consul only as the Vault backend, is there a reason why you are not considering integrated storage?
In addition, I would recommend you use a version that is at least
N is the latest major version for any HashiCorop Product. Only these versions would get bug/security fixes being the only actively maintained versions. You can read more about this here: Support Period and End-of-Life (EOL) Policy – HashiCorp Help Center