How do I place the STM32WB55 into Shutdown Mode with WKUP pins and RTC wakeup sources?

[JOno1]

I am unable to successfully put the STM32WB55 into Shutdown mode and then wakeup via either one of the WKUP pins or the RTC. I can get the WKUP pins to work if I use HAL_PWRex_DisableInternalWakeupLine, but then it won't wakeup via the RTC. If I omit DisableInternalWakeupLine, the MCU will not enter Shutdown mode at all.