It will always error out (unfortunately) due to the fact that hold invoices are... not exactly standard. It should work, however, if you wait and check the site.

More info here on wallet compatibility (which is a big issue with RoboSats right now):

https://learn.robosats.com/docs/wallets/

Awesome project. Respect! 
Just tried it and sadly only get error messages in Zeus App (FOSS) when scanning the QR. 

RenHodl

There's also this great video tutorial:
 
*I made a video tutorial for Robosats non-KYC Bitcoin*
https://stacker.news/items/19732
https://www.youtube.com/watch?v=XW_wzRz_BDI
https://piped.kavin.rocks/watch?v=XW_wzRz_BDI <-- May be easier to watch using this Youtube front-end