I am trying to append each person who have modified a SharePoint list item to a variable, so there is a record of all Modifiers and I can use that variable in emails and Microsoft Teams posts. I am new to Flow and Power Automate and I can't seem to be able to figure this out. Any help would be appreciated.
Not sure if this would completely answer your question, as I don't know which fields are being updated in the SPList.
Trigger: When SPList is updated
Send Email(?) with field: Modified By. That is, if you want to received multiple emails every time the list gets updated.
PS There are other ways to do this with the Multi-line Text Column, however, you seem to want to send this information out of SP. You could also explore the native "Alert" feature in SPLists. How to set alerts on SPLists