> 1. Is there an issue updating cib.xml with cibadmin command when Pacemaker is running
It is fine, unless you know what you are doing. In particular, in order to add a new node, corosync should find it in first place and only then pacemaker can add it to the CIB. So I would recommend trying my previously mentioned approach without editing the CIB, it is just not necessary in this case.
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