Hi Ahmed,
Thanks for your response. It is strange but I just checked it and you are correct that the AMP pages are showing valid now.
When I go to the webmaster, it shows that some of my pages are now valid.
The last time I checked (2 days ago), all of my pages are invalid. Now it shows 75% are valid.
It is strange because I did not do any changes.
I guess my question now is whether I have to submit all of my invalid pages manually to google or should I just wait?
I have checked several invalid amp pages and it shows me that it is now valid, however the webmaster shows it is still invalid.
Once again, thanks for your help.
Webmaster Screenshot