Hi @Mark Phillips,
Welcome to the Microsoft Q&A Platform!
We are glad that you were able to resolve your issue and thank you for posting your solution so that others experiencing the same thing can easily reference this! Since the Microsoft Q&A community has a policy that "The question author cannot accept their own answer. They can only accept answers by others ", I'll repost your solution in case you'd like to accept the answer.
Solution:
Perhaps someone has noticed this. I tried the same support request today and this time I was offered the option to create a ticket, so this is now in progress, thank you.
If this answers your query, do click Accept Answer and Yes for was this answer helpful. And, if you have any further query do let us know.