Hello Javier,
I think the first problem is solved.
At the step "Wait for approvel" the wrong "Approval ID" was entered
On the second problem:
Ah okay, I was thinking you would have to enter the mail from the team channel where the approval step ends up.
In the step "Create an approval" the mail address of me is now entered and I am also the one who has approved the step in the team channel but the step "Wait for approval" does not run any further
Been sitting at the workflow for 3 days now, but I think we are on the right track 😉
LG Daniel