Hi @warryvanarkel ,
Do you want flow to update the corresponding sharepoint list based on the value you enter?
Until then, could you please tell me if the columns of all sharepoint lists are the same except for the name?
if yes,
Here is test for your reference:
Here are share point list:


Here is flow:
Url:_api/web/lists/getbytitle('yourlistName}')/items
Headers:
{
"content-type": "application/json;odata=verbose"
}
Body:
{
"__metadata": {
"type": "SP.Data.yourlistNameListItem"
},
"Title": "Demo Task1",
"Name":"11"
}

Here is result:


Best Regards
Cheng Feng