Unable to turn off Find My on my iPhone
cannot turn off find my iphone there was a problem removing this iphone from your account
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Find My iPhone cannot be turned off if the Stolen Device Protection is enabled.
See the pic below which is self-explanatory to turn Stolen Device Protection Off.
Probably you have "Always" Ticked in place of "Away from Familiar Location"
For enhanced security, there's a one-hour delay when changing your location settings from "Always" to "Away from Familiar Location." This applies even if you use Face ID for authentication.
A delay will be required when you are not at a familiar location, such as your home or work, to change security settings.
Know more --> About Stolen Device Protection for iPhone