Using one and the same ccleaner.ini config file I run CCleaner 6.15 on a working Win 10 system:
1) - with removed winapp2.ini: no errors in MS account, no sign-out of MS account; MS Account/profile picture shows perfectly. 2 times restarted PC - still all working as expected.
2) - with updated (with CCEnhancer-4.5.7.exe) winapp2.ini: after restart of system MS To-Do and Sticky Notes have been signed out of MS account, MS Account/profile picture has been removed.
My conclusion: the problem lies in "winapp2.ini"