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Same problem here:

This service is older (v9) than the minimum (v22) version of the rest of the deployment. Unable to continue. (HTTP 400)

I will be very glad to have a solution for that.

Thank you.

SOLUTION:

I had non-used hosts in my "services" table ("nova" database) that had old versions. Deleting these entries solved my problem:

mysql -uroot -p

USE nova;

DELETE FROM services WHERE version = '9';