Cut and paste this URL to share the unmodified register and value:
https://regviz.com/r/Keil/AT32F413xx_v2/IOMUX/REMAP3#0x0
IO MUX remap register 3
TMR9 muxing
TMR10 muxing
TMR11 muxing
https://github.com/cmsis-svd/cmsis-svd-data