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Most probably this error occurs since locale for web site is set to non-default language (1033) and the incorrect delimiter is specified for a function (in your case the delimiter is ,) The delimiter in formula is language dependent. For example when web locale is set to 1035 (Finnish) then the proper syntax for formula is: =AND(ISERROR(FIND(" ...
You can add additional lookup field or select lookup field as ID in field settings: To Select Lookup Field as ID instead of Title: To Select ID as well as Title
You can assign multiple people in task list, for that you do following. Go to List settings --> Click on Assigned To column, then Under Allow Multiple selections, select Yes radio button. If you have built this as an app then you might need to specify in the people picker that multiples are allowed.
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