Email app not working after IOS 15.1 update to 5th generation iPad HELP!

Holy moly... can't believe I found it, guys ...

Looks like the update automatically simply switched off the email-app in icloud -

found it in :

• settings --> tap your Name-tag top-left (where it says 'Apple ID, iCloud, Media&... ) --> then tap the iCloud icon --> and there in the list make sure the email-app is turned on green - { all the apps showing in that scrolldown-list - safari, contacts, messages, etc etc... were on green... except for Email ! - turned it on... and schwuppdiwupp... all is happy again }
• hope this works for everyone else, too !!