Modbus error "FC Not Valid" Yaskawa ga500

Can someone assist me with this error

"FC Not Valid"

2/18/2022, 7:27:29 PMnode: 876daccbf05b1c27msg : string[12]

"FC Not Valid"

none of the write Function Codes work, the same error on all Write functions this is a Yaskawa Drive ga500
reading registers works fine

please assist

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