Technical Tip: Cannot select FortiSwitch VLAN to pass them over VXLAN

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Description	This article describes why it is impossible to select FortiSwitch VLAN to pass them over VXLAN.
Scope	FortiSwitch v7.2 and earlier.
Solution	The user wants to configure a VXLAN connection between two FortiGate appliances that are located in different geographic locations. The configuration has been done and the VXLAN connection has been established successfully. The customer intends to add some VLANs to the VXLAN, and these VLANs were created through FortiLink, where the user uses FortiSwitches. Fortinet provides documentation that suggests creating a 'Software-Switch Interface' and adding the VXLAN interface along with the VLAN interfaces to this new interface. See the below article: Technical Tip: VXLAN with SD-WAN. However, there is a problem: existing FortiSwitch VLANs cannot be selected to be added to the 'Software-Switch Interface'. When new FortiSwitch VLANs are created, these new VLANs can be inserted normally on this interface. This behavior is not a bug, but rather an expected behavior as it is needed to delete all dependencies created for the pre-existent VLANs in order to be selected on the software switch interface on FortiGate.