Just tried it on the pixel and it works now. My oneplus 6t is not working. I’m not sure what could be blocking it and not the classic app?
The wonders of Android. First Google makes it, then the phone maker adds layers of cruft, then the carrier add layers of cruft. 
Any ideas, I wish there was logs to help. I know smartthings customer service has logs and there were errors seen on my account but they just keep saying they are waiting for tier 2 to respond back.
Not really. I used to run an Android app called OS Monitor or something. One thing it could do was show the syslog. Not sure you’ll be able to find anything in the volume it generates.
What is the status on this? It’s now January 2020, and this issue still exists?
It appears so, at least I am having a problem with my Pixel 3 downloading the smart lock guest access…
Same here, Pixel 2 XL, cannot use smart lock guest access. Says “couldn’t download smart lock guest access. please try again.” SUPER LAME this has been an issue since Sept of last year with no resolution. Will try calling them for an update I guess. In the meantime unable to add lock codes on the rental house, FRUSTRATING to say the least… Shame on you Samsung
Permissions… and Special Access in app settings… While teaching Childrens Intro to Mobile Technology at Crossroads Community Church, We had a day where the children were instructed to question thier parents and or elders on common mobile tech issues and work with them on solutions… 43.2 % of app failures were result of permissions being denied… the most common being “Display over Other Apps” not allowed… In short try checking application settings for problematic apps and allow storage access most importantly then Under , Special App Access allow Display over other apps…I know this current issue may be long since resolved so this response is for those currently searching for resolution to similar problems…
I hope this helps…
Ansun Lee Perry