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Check-In

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Check In Error 403599307

New Arrival

Checking in to a flight from STL to JAX through mobile app, but keep getting an error that reads "Boarding pass can be obtained at airport, Mobile boarding pass in not available.  Error: 403599307 ZVF1nBHIQKCNdE1fBGEPEA-API."  Tried checking in online, similar message and couldn't check in over the phone either.  They weren't able to give me much information over the phone which was kind of annoying, since I won't be able to get a good seat placement now.  Has anybody ever dealt with this before?  I haven't changed any information on my Southwest account, and everything is showing correctly on there as well.