Changing emails...

I tried to change my email and the system tells me what I've entered is invalid. Both my current email and the new one are Hotmail addresses. Any way I can remedy this?
SEIBERTRON - Your Planet For Everything Transformers
https://www.seibertron.com/energonpub/
https://www.seibertron.com/energonpub/viewtopic.php?f=14&t=18372