You can refer to my options listed in the latest post.

We sure did. I have a thread here detailing it: https://experienceleaguecommunities.adobe.com/t5/adobe-experience-manager/cannot-add-or-edit-components-in-touch-ui/m-p/575438

For anyone in the future running into this issue as well, what I've found from here and elsewhere is:1. We're currently on 6.5 SP18. According to the patch notes, 6.5 SP19 fixes this (see "Fixed Issues" -> "Page Editor") Just going to paste the change log here as well to future-proof, since Adobe lo...

For anyone stumbling across this in the future still looking for an answer, a support rep replied to my ticket and suggested this is a known issue with SP17 on 6.5. Ref: CQ-4353652 Good luck all!

Setting the log level to debug does not appear to generate any additional log output information. Wondering if I'm missing something in the configuration there... but otherwise nothing sticks out? Same error as in the original post is present, nothing more. As for SMTP access

Not on AEMaaCS, this is AMS/ACM. Regardless, going to see about accessing to grab the error.log.

Will see about grabbing the full error.log. ...validate : That the AEM instance can successfully connect to the configured SMTP server. Yes, this instance is able to access the smtp server.Confirm that the submitting user and assigned group have valid email addresses associated with their user accou...

The old tried and true. This was the first thing we tried though!

Well, that's the thing... This is all that is being posted in the log. 

Hello all! The community has been very helpful with past issues, so I figured I'd bring this one here as well - Perhaps you'll all have some ideas. I've seen a lot of people with EMailNotificationService or various other workflow-email-related issues that are typically configuration errors resolved ...