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Hi Paul Rodwell,
what u are hitting is a stuck resource move state not something u can fix from the portal. The move partially completed then the provider notification failed so Azure marked the networking resources as being in a move operation. When that flag is set NRP blocks any updates like attaching a public ip.
Msft documents the general move limitations https://learn.microsoft.com/azure/azure-resource-manager/management/move-resource-group-and-subscription and known restrictions and provider specific constraints at https://learn.microsoft.com/azure/azure-resource-manager/management/move-support-resources
The error NotificationAfterMoveFailed and ResourceMoveFailed usually means the backend provider notification did not complete which requires msft intervention https://learn.microsoft.com/azure/azure-resource-manager/management/move-resource-group-and-subscription#troubleshoot-move-errors
Even u do not have a paid support plan u can still open a free request under subscription or resource management issues. Go to Help and support > Create a support request and choose Subscription management. Subscription and resource move issues are generally covered without a paid technical plan https://learn.microsoft.com/azure/azure-portal/supportability/how-to-create-azure-support-request
Unf there is no self service fix for a locked move operation, only msft guys can clear that flag.
rgds,
Alex