Why is my screen lock 'none' disabled by administrator?

I currently have a pin on my phone but I want to take it off and either have none or just swipe but both say ‘disabled by administrator, encryption policy, or credential storage’. I’ve tried everything to fix it. I tried clearing all of my credentials. I’ve tried deactivating device administrators. My phone says it’s encrypted but won’t let me decrypt it. I have no clue why. It just won’t let me click on it. Any sort of help would be greatly appreciated.