loe-lobo thank you for the message. This migration error means that AAM was not able to recognize the ACCESS EXPIRE access setting for the Posts & Terms.
In your particular case, you've checked the ACCESS EXPIRES option, however, you did not define the time when access actually expires.
My best recommendation is to be more particular about how you define access settings to your content. For example, if you need to completely restrict access to your post, you can just select HIDDEN and RESTRICTED options. No need to check ALL the options as this only takes your time and, in some instances may confuse AAM.
Keep me posted.