Sure, you’re doing a great job shifting offline data from your CRM into Google Analytics 4, but the issue you’ve encountered with the “timestamp_micros” not showing up is related to the format. The format you’re using (2021-04-08T22:25:09.335541+02:00) seems legit, but it must be noted that Google Analytics requires Unix time format for “timestamp_micros”.

Here’s a reference to Google’s documentation example for timestamp_micros format: https://support.google.com/analytics/answer/10325025?hl=en#template

It’s a Unix time format as visible in this example: https://i.stack.imgur.com/yBA9k.png

Once you format your timestamps in Unix time, it should improve the accuracy of the event timestamps in your reports. Keep it up!