Error clustering DNS

Existing Server Virtualmin 6.13 on CentOS Linux 7.9.2009
New Slave Server Virtualmin 6.13 on CentOS Linux 8.2.2004
Webmin Version 1.960 on both servers.

The host is existing and has been running a while; the slave I just created, specifically for the purpose of being a secondary BIND server, slaved to the existing server.

I followed the directions on this page:

I got the new slave server configured under the Webmin Servers Index, but when I try to configure the slave in BIND is get this message:

Adding xxx.xxx.xx.xx ā€¦
Server xxx.xxx.xx.xx is not running Webmin version 1.202 or above.

Aaaand, Iā€™m stuck. Any ideas?

Resolved this myself with another web query. Someone on this link had the same issue:

The solution: delete and add the slave server, but make sure the SSL box is checked. Done.

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