Apparently Collector 17.0.4 and android 7 don't play nicely with each other. I allowed my android tablet to upgrade from 6 to 7 and now Collector won't load any maps. Some have performed hard factor resets and had success, some have not had the same success. I would rather not downgrade to android 6 again. See the following thread:
https://community.esri.com/thread/197562-collector-will-not-load-maps-on-android-70
What kind of device do you have?
EDIT - I found out that it is a Samsung Galaxy Tab E -
Samsung Galaxy Tab E previously running Android 6.0.1, now running 7.1.1
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