Make sure VLAN / ports are assoiciated with a STP domain so the ports can particiapate in STP. Check with show vlan (T flag means VLAN is member of a STP domain) or show stpd (check VLAN bindings).

Created VLAN 11 and moved port 5 to it and purposely tried to set p-t-p link knowing VLAN not part of STP domain…

* EXOS-VM.28 # create vlan 11
* EXOS-VM.29 # configure vlan 11 add ports 5
VLAN 11 VLAN_0011:  Port 5 untagged has been auto-moved from VLAN “Default” to “VLAN_0011”.

* EXOS-VM.30 # show stpd s0 p 5-8
Port     Mode   State      Cost  Flags     Priority Port ID Designated Bridge
Port 5 not in STP domain s0
6      802.1D FORWARDING 200000 eDap-w–B- 128      8006    80:00:0c:72:16:86:e7:00
7      802.1D FORWARDING 200000 eDap-w–B- 128      8007    80:00:0c:72:16:86:e7:00
8      802.1D FORWARDING 200000 eDap-w–B- 128      8008    80:00:0c:72:16:86:e7:00

Total Ports: 3

————————- Flags: —————————-
1:                e=Enable, d=Disable
2: (Port role)    R=Root, D=Designated, A=Alternate, B=Backup, M=Master
3: (Config type)  b=broadcast, p=point-to-point, e=edge, a=auto
4: (Oper. type)   b=broadcast, p=point-to-point, e=edge
5:                p=proposing, a=agree
6: (partner mode) d = 802.1d, w = 802.1w, m = mstp
7:                i = edgeport inconsistency
8:                S = edgeport safe guard active
s = edgeport safe guard configured but inactive
8:                G = edgeport safe guard bpdu restrict active in 802.1w and mstp
g = edgeport safe guard bpdu restrict active in 802.1d
9:                B = Boundary, I = Internal
10:               r = restricted role, t = active role
* EXOS-VM.31 # configure stpd s0 ports link-type point-to-point 5
Error: Port 5 is not a member of STP domain s0
Error: Command aborted due to input errors, no changes made
* EXOS-VM.32 #

After binding VLAN 11 I can set port 5 as link-type point-to-point…

* EXOS-VM.33 # enable stpd s0 auto-bind vlan 11
* EXOS-VM.34 # configure stpd s0 ports link-type point-to-point 5

* EXOS-VM.35 # show stpd s0 port 5
Port     Mode   State      Cost  Flags     Priority Port ID Designated Bridge
5      802.1D FORWARDING 200000 eDpppw–B- 128      8005    80:00:0c:72:16:86:e7:00