Answering with a vague generality...
Whenever I've looked closely at this, it has been my experience that the better the school and the more advanced in the curriculum the course is, the less likely they are to accept a transfer credit. From anywhere, online or no.
For this question in the context of an undergrad, it is advisable to stick with general ed low-end requirements that are more likely to transfer. Since those are fewer and farther between at the masters level, you are on thinner ice. We have talked here before about some online masters. But you are asking a different question -- external transfer credits (online or no) to a resident masters.
The only person that can give you an accurate answer is the registrar of the resident degree-granting institution that you are seeking credit from for your external (to them) activity.
As far as policies, with a minimum bit of looking you should be able to find their general policy on transfer credits. Perhaps others more current in academia can speak to how flexible they are in applying those procedures in practice. Your mileage may vary, but probably only a little on the fringe from the formal policy.
I'd be surprised if the "certificate" part of your RFI meant any more than the individual coursework, at least with regard to its acceptance at your institution TBD. And the higher end courses you might need to pursue to get the cert are probably those that are least likely to transfer, so you may be on the horns of a dilemna.
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