troubleshooting Question

Router bloicks WAN IP for Cisco VLAN

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bgravesFlag for United States of America asked on
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Cisco RV345 router in a static IP mode.
ISP gives me IPs of   x.y.z.232 /29 with gateway x.y.z.233
I set RV345 WAN as x.y.z.234 /29

Now I try to define a globally known address using a VLAN to connect a server:
  so maybe a server at x.y.z.236 with an interface on a port asdsigned to VLAN1.
  VLAN 1: IP x.y.z.235 /29  and the RV345 gives a red box and won't allow it.
  because I am not so smart, I try /30 and it also errors
  Tried other IPs, x.y.z.236 through x.y.z.238 and they all fail
  Any IP OUTSIDE the router's WAN range x.y.z.232 /29 is allowed.

I want the server's IP to be one of the ISP assigned values, but the RV345 seems to prevent it.
What am I missing here?
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