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It's in 3.4.4

older keystone supported both xml and json.
Amanda is using xml.
xml support was removed in Juno !!!

amanda must be enhanced to use json !!!

The URL to get a token is probably https://auth.cloud.ovh.net/v2.0/tokens
S3_HOST "auth.cloud.ovh.net"
S3_SERVICE_PATH "/v2.0/tokens"

Why do you believe someone know the answer? You are the one using OVH, you are the one that should know the answer!

Did you search the OVH web site for the information? Or you are asking someone...

We already support it!!!

I already told you to correctly set S3_SERVICE_PATH and S3_HOST.

And S3_HOST must be the hostname of the authentication server.

The S3_SERVICE_PATH should probably be "/v2.0/tokens"

You posted no information about the failure, how do you believe someone can help you!!!!

What error do you get?
Post your configuration.
Add 'device-property "VERBOSE" "YES"' in the changer...