Apologies for my late reply, i got sidetracked with some personal stuff.
Unless someone else has a nifty idea, i think you have 2 choices here. As the access token isn't available via a request/response's raw request/response content you need another option. I tested a system that used OAuth v2.0 last year, but it had been customised so much that the embedded OAuth functionality in ReadyAPI! didn't work so i had to setup all the individual requests that comprise the back and forth that makes up the OAuth v2.0 auth which allowed me to do what you need to extract the access token to save it to a property. This option would allow you to do what you need, but it did take a lot of effort to automate the whole thing. Obviously i can understand how you wouldnt want to adopt this approach considering youve already got your OAuth setup already.
2nd option i can think of is if you raise a support call with Smartbear and see if they can advise how to extract the token value (its got to be persisted in a variable somewhere under the covers, right?) considering it doesnt look like anyone on the forum can help at this point....??
Sorry i cant be of more help,
if this helped answer the post, could you please mark it as 'solved'? Also if you consider whether the title of your post is relevant? Perhaps if the post is solved, it might make sense to update the Subject header field of the post to something more descriptive? This will help people when searching for problems. Ta
One more thing, you have mentioned that you have set up all the individual requests that comprise the back and forth which helped you to extract the access token and save it in a property. How did you do that?
Though I have the OAuth setup already, I would like to automate the below steps sequentially.
1)The clicking of 'Get Access Token' Button
2) Entering the login credentials on the login page of application.
3) Extracting the verification code from outlook and entering on the next page after login.
4) Extracting the access token and adding it in the header.
While using OAuth 2 flow, you need to select the checkbox of 'Use Authorization Header' as shown in the attached screenshot. Then, you don'tneed to add the token in the Headers tab Ex. Authorization: Bearer [Access Token]. After that, you can use the AuthManager and select the respective OAuth 2 profile for your requests.