Just to make sure: I searched every post on the forum related to this problem, but without any clear answer.

We added a GTM script (just the plain script on Google Tag Platform) to our module and tried several implementations of this script to make it work:
- Add script on module level by required scripts section
- Add script on page level by required scripts section 
- Execute script in Layout webblock OnReady and/or OnRender by RequireScript client action
- Execute script by JS code in Layout webblock OnReady and/or OnRender
- Use Forge component 'GoogleTagManagerReactive' and add the HeaderBlock (and/or BodyBlock) with the right ID.
- And much more...

Problem is that when we navigate to a different screen, we get the error 'There was an error processing your request' with in the console the following 'Mismatched anonymous define() module: function (exports) { 'use strict';'

Even with this error and searching on Google I'm not able to find a clear solution what to do and/or how to fix this. Hopefully someone could help us.

Btw, we even tried this with a module with just 2 sample pages and no additional code.