Simple flow of only one element Compose where I have this:

and response is:

No matter what I enter in convertToUtc it throws this error.
I tried entering date/time manually as well, but error is the same. f.i.
convertToUtc('2019-10-10T00:00:00Z','FLE StandardTime')
convertTimeZone(utcNow(),'FLE Standard Time','UTC') does not throw error, but does not convert anything either.
convertFromUtc works as expected.
Can someone suggest how to convert from local time to UTC ? I want to pass UTC time to SharePoint.