There is no need for a grace period. People using OAuth 2.0 can still do OAuth 
2.0. People using OAuth 2.1 will do OAuth 2.1. 

 — Justin

> On Feb 18, 2020, at 3:54 PM, Anthony Nadalin 
> <tonynad=40microsoft....@dmarc.ietf.org> wrote:
> 
> I would suggest a SHOULD NOT instead of MUST, there are still sites using 
> this and a grace period should be provided before a MUST is pushed out as 
> there are valid use cases out there still.
>  
> From: OAuth <oauth-boun...@ietf.org> On Behalf Of Dick Hardt
> Sent: Tuesday, February 18, 2020 12:37 PM
> To: oauth@ietf.org
> Subject: [EXTERNAL] [OAUTH-WG] OAuth 2.1: dropping password grant
>  
> Hey List 
>  
> (Once again using the OAuth 2.1 name as a placeholder for the doc that Aaron, 
> Torsten, and I are working on)
>  
> In the security topics doc
>  
> https://tools.ietf.org/html/draft-ietf-oauth-security-topics-14#section-2.4 
> <https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Ftools..ietf.org%2Fhtml%2Fdraft-ietf-oauth-security-topics-14%23section-2.4&data=02%7C01%7Ctonynad%40microsoft.com%7C47bb597eef584c95ba4108d7b4b274b2%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637176550905333283&sdata=nA1S7TBfZg6cSwY2hI8hpRXhIA2joaaJFmNXrATgr2Y%3D&reserved=0>
>  
> The password grant MUST not be used.
>  
> Some background for those interested. I added this grant into OAuth 2.0 to 
> allow applications that had been provided password to migrate. Even with the 
> caveats in OAuth 2.0, implementors decide they want to prompt the user to 
> enter their credentials, the anti-pattern OAuth was created to eliminate. 
>  
>  
> Does anyone have concerns with dropping the password grant from the OAuth 2.1 
> document so that developers don't use it?
>  
> /Dick
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