Yes, it is totally random.
We have 5 Interval exchanges this year.
For 4 of these they added our MR number straight away with no problem at all.
For the 5th I will just have to try a different email contact or phone the Platinum help line.
Sending an email to
internet.customer.care@marriott.com always used to work for us.
Now they seem to have started replying with
"The Customer Care team at Marriott Vacations Worldwide will be happy to address your needs and concerns. I forwarded your message to Marriott Vacations Worldwide. You should be hearing from them shortly or you may also contact them directly by using one of the following:......"
then
MVWCCRequests@vacationclub.com reply
"Thank you for contacting Marriott Vacations Worldwide Customer Care Department. Your Marriott Rewards number cannot be added to the requested reservation until check-in because your reservation is an Interval International exchange reservation. Please provide your Marriott Rewards number upon check-in to the resort...."
This is total madness!