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How about you don't depreciate ways for us to access our data. Looks like we'll have to spend the energy to go back to the onprem version.
Category: Development
STATUS DETAILS
Declined
Ideas Administrator

Thanks for your feedback.
Security is a top priority and moving to OAuth provides a better option than Basic Auth does. Microsoft online services are all governed by AAD, and thereby OAuth2.  
There are resources avaliable for OAuth:

Henrik Westergaard Hansen
Program Manager
Dynamics 365 Business Central