Limiting text length in free text field


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Outlook version
Outlook 2016 64 bit
Email Account
Exchange Server
Please help

I am updating an outlook form. I have a field whose type is set to text and whose property is set to value. The field name is "sys" It is a free text field. I would like to to limit user entries to text of length 50 characters or less. So I am trying to use a validation formula and a validation message.

When I use this Len("sys")<=50

I get NO validation message whether I enter less than 50 characters or more than 50 characters


When I use the greater than sign: Len("sys")>=50

I get the validation message whether the user entered more than 50 characters or less than 50 characters

Question: What am I doing wrong and how can I limit entries to text of length 50 characters or less?