There have been multiple phasing documents, issued before the v2 rules. Some that say if Joint accounts for two account holders only has been implemented that it would be compliant, however, I can see no reference to this in the rules, and therefore interpret this to mean that for non-majors – we should deliver multiple joint account holders for Nov 21 compliance date (Part 4).
Can you please confirm if my interpretation is correct?
Yes, that's correct. Non-majors need to deliver to the new joint account rules (including multiple joint account holders) by the November 2021 compliance deadline.