I invite colleagues to join axure cloud,But he didn't receive an invitation

I invite colleagues to join axure cloud,But he didn’t receive an invitation. I use Axure in China,Please help me out。How can I get my colleagues to join the project in auxer cloud

@Joe-wx I hope you are well!
We were having some issues with specific email providers. These issue should now all be resolved with our latest Axure Cloud update so you should no longer encounter this issue.

All the best,
Raleigh