What do you want to happen if not all of them respond within x time and you continue your flow? I mean, will the approval be treated as Rejected, Cancelled, or still Approved? And how long do you expect x to be?
I would set a Timeout on your Approval and have a Parallel Branch. One that runs on Success (all approved) and one on Timed out (not all approved).
See example flow structure below.
Note that we don't use Start and wait for an approval as we won't be able to get the Approval ID if it times out. We instead use Create an approval and then Wait for an approval. This way we can get the Approval ID from Create an approval since this will be successful and only the Wait for an approval will potentially time out.
Create an approval will start the approval.
Wait for an approval will wait until the approval has been fully completed. For this we go into Settings and set a Timeout period to suit your requirements. In my example for testing purposes, I've set it to timeout after 1 minute - PT1M.
I would then add a Scope for the success branch (if all users approved). Then add a parallel branch and add another Scope to be used when the Wait for an approval action times out.
On the Scope NOT All Approved we would go into Settings > Configure run after and set it to has timed out.
If Wait for an approval is successful it will go to the Left Branch. This means that all recipients have responded.
If Wait for an approval times out it will go to the Right Branch. In here you can get the Approval ID and set the approval in Dataverse to Cancelled or Timed Out which will ensure all existing Approval Tasks that are still with the original recipients will see that the approval has completed. Otherwise, their Approval Tasks will still look like their active and even let them add comments and click on Approve or Reject.
Note that because you are running Scope NOT All Approved via a time-out, you will need to add a Terminate at the end and set it to Succeeded, otherwise the flow will look like it failed even if it actually succeeded.
Below might be what your Scope NOT All Approved action might look like if you are also updating your Approvals table in Dataverse.
