Most UI/UX designers would say that the affirmative verb on a button should match the one in the accompanying message.
E.g. the Windows guidelines say:
Use buttons with text that identifies specific responses to the main instruction or content. An example is, "Do you want to allow AppName to access your location?", followed by "Allow" and "Block" buttons. Specific responses can be understood more quickly, resulting in efficient decision making.
Avoid using generic patterns such as "OK/Cancel".
and the Mac guidelines say:
Ensure that the default button name corresponds to the action you describe. In particular, it’s a good idea to avoid using OK for the default button. The meaning of OK can be unclear even in alerts that ask if users are sure they want to do something. For example, does OK mean “OK, I want to complete the action” or “OK, I now understand the negative results my action would have caused”?
Using a more focused button name, such as Erase, Convert, Clear, or Delete, helps make sure that users understand the action they’re taking.
So if the customer has just read a message that says "Click here to confirm [something]", then I would certainly consider having the button label be "Confirm".
(Background: I've been a UI designer for the past 20+ years.)