Hi Mike.
The symptoms you’re describing sound like RedBoard pins D0 (RX) and D1 (TX) are not getting disconnected from the LTE module on the shield when the switch is moved to the SOFT position. The RedBoard receives code from the Arduino IDE over pins D0 and D1 during programming and if the shield is connected to those, you end up with bus contention issues and that would cause the upload to fail. The issue going away when you remove the shield would confirm this.
I think we need to get your shield back for testing. Can I get your SparkFun order/invoice number?
Hi Chris, my order number is 5956139.
Yes the issue resolves when the shield is removed.
Hi RobotMike.
I private messaged you on 2/24/20 about this. Did you see my response?
Hi Chris,
I emailed you a couple of questons. 1 . Would this also be a problem with the SAMD 21 Dev board? 2. Is there a different LTE arduino sparkfun library for the LTE Shield for the Samd boarD? The current library doesn’t compile for SAMD, I filed Gitbug issue.
never mind about #2. i saw how to fix that problem in the comments
We’ve not tested this product on the SAMD 21 Dev board. You could probably get it working but may need to change the libraries and/or example code to do that.
You’re better off going with an Uno based board since we’ve tested all the example code on that and everything functions.