Did you try to remove your google framework services and install it with an older version? If not then try my method:

1. download the required file - google framework service and google account manager.
2. install google account manager
3. run google account manager>storage>clear cache>clear data
3. go to your phone setting>app>click on the 3 dots on top right side>show system processes
4. at search app type framework, then you will see google services framework. click it then go to storage>clear cache>clear data
5. uninstall google services framework
6. now install the older google services framework
7. restart your phone. after restart, go to setting>users & accounts> add an account>google>click existing and follow the step (verification etc)

you should be able to access all your google apps, for the notification pop up just swipe and disable notification.

you can download the file from my google drive here : https://drive.google.com/file/d/1NumTpV_5At...iew?usp=sharing

enjoy your huawei mate 30 pro 

gmail is owrking on mine too. maybe you shall check with IT person.
no reason that gmail not working if others are fine.

Receive emui 10.1 today. Now updating

mean you have gms before update right?
or you mean you update the emui 10.1 and then sideload gms?

Are you on 10.1 now?

I have previously installed GMS using old LZPLAY method.. Stupid enough, I reset the phone - thought it can be backup-restore later.. 

But I managed to install GMS using new LZPLAY method - but seems not to the fullest Google experience - Play protect certification gives out device not certified   

You may try to install GMS using this new method..

https://www.youtube.com/watch?v=QioqroG9H6s

https://www.youtube.com/watch?v=0TSuuR81HpA

It's Huawei Cloud 50GB monthly fee. 1st month is free offer only.