Submit to the Apple App Store from Expo.

While Submit to the Apple App Store from Expo using command:

npx eas submit -p ios

After you login with your applce developer account, you got error message:

Authentication with Apple Developer Portal failed!
Apple provided the following error info:
Service not available because of maintenance activities, please try again after some time.
Submission failed

First step run:

npm install -g eas-cli

Now the error maybe will be like this:

Authentication with Apple Developer Portal failed!
Apple provided the following error info:
Your developer account needs to be updated. Please visit Apple Developer Registration.
Submission failed

If you get the above error message, then you need to login https://developer.apple.com/ and confirm any updates or some new agreement you need to approve, If you didn’t subscribe to Apple Developer Program Membership before then you will need to subscribe to it.

Then run again:

npx eas submit -p ios