I think that due to the lack of separators access won't recognise your field a valid date.
If you type the following into the immediate window you get a type mismatch.
? datevalue ("20200123")
So you may need to do some formatting of the string first.
do not include the / signs in your format. Start Date: Format([IW73 TBL with SN]![Start Date],"yyyy/mm/dd") Start Date: Format([IW73 TBL with SN]![Start Date],"yyyy mm dd")