GTM for Mobile Apps doesn't allow to drop parameters longer than 24 characters

Question

Goal

• Drop parameters names (= key names) that are longer than 24 characters.

GTM UI

• When I want to save tag with such a settings, it shows the error message in the area where parameters can be dropped. Please see screenshot here:

Further investigation

• Problem is in GTM account for Android and iOS as well
• Max length of event-parameter name for GA4 collection is 40 characters

Questions What is reason for such a behaviour within GTM account? It seems to be an issue, probably bug issue. Is it possible to fix this? Thanks.

Answer 1

It looks like this is a bug when you specify more than 24 characters of parameter name in the Parameters to Drop section only

Workaround:

• Create a constant variable in GTM
• Input the parameter name in that variable
• Use the constant variable in the Parameters to Drop section instead of string text and it will work