couldn't verify your 360 office subscription

Hi there,

My office used exchange server and 360 office. I installed word, excel and outlook in my own macbook (yosemite) through 360 office account

Questions :

Sometimes, when my outlook has been loaded, i've been notice that "outlook can't verify your 360 office subscription" ? I click retry, it won't work, then I click "remind me later" and the noticement go away, and I can use my outlook

It happens in excel as well

But sometimes this does not happened

I used the same account on my windows laptop as well, and never met this issue

I've checked to my account, and I still have 3 install left

Here I attached the screeshot