Hi Ahmed,
please take a look at the GTAC Knowledge article
How to configure RSTP in EXOS.
The auto-bind feature works for ports that are added to the VLAN after auto-bind has been enabled, thus you might need to add some ports manually. You can use "show stpd s0 ports" to verify which ports are configured for spanning tree.
You need an untagged VLAN on any port participating in RSTP on EXOS, if you want to tagg all VLANs on that port you need to use MSTP instead. (Note that MSTP is compatible with RSTP.)
Best regards,
Erik