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WorkOS
The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.
I would also recommend taking a look at Meshtastic. It's an off-grid communicator that doesn't require a HAM license. It uses the unlicensed (open) 915MHz ISM band (for the US and Canada). Even though the output power is capped at 1 watt it can still reach distances as far as 50 miles (with line of site). I have personally tested it out to 12 miles using two handheld nodes. Oh, it's encrypted too. You can have a private channel with your team. It's also easy to setup fixed nodes to bridge areas that lack line of site (like a solar node on a hill).
Look at the serval project http://www.servalproject.org/