An icy vent line may have caused Blue Origin to scrub debut launch of New Glenn

>According to sources, the primary problem was likely ice clogging one of the vent lines that carry pressurized gas away from the vehicle. Several attempts were made to melt the ice, but these efforts were not successful, necessitating the scrub.

That should be an easy fix.

>Additionally there appears to have been a problem with at least one of the auxiliary power units that provide power to the rocket after the engines shut off.

Ariane 6 had a similar issue during it’s maiden flight.

>An Ariane 6 Launcher Task Force update has identified exceeded temperature limits as the cause of an APU anomaly during the rocket’s inaugural flight.

https://europeanspaceflight.com/investigation-identifies-cause-of-ariane-6-apu-anomaly/