Can't create a routing mark

/ip firewall mangle add action=mark-routing chain=output connection-mark=WAN1_conn new-routing-mark=to_WAN1 passthrough=no

input does not match any value of new-routing-mark

What is changed in V7 vs V6 ?
Thank you

You haven't explained what you're trying to do,
on what version of RouterOS,
on what machine,
and what you expect to happen in the end.

The difference between v6 and v7 is as follows.

In version 7 you must create the table independently
add fib name=Name_Of_Table

Use the name of the new table as the routing mark.
Use the name of the new table as s the routing-table=Name_Of_Table in the IP Route

so no more "new routing mark" but routing table name as mark, thank you

Incorrect, at least in that in the mangle rule you still use new-routing-mark= or whatever the syntax is.
In the IP route config, correct no mention of routing mark, one uses the associated routing-table created....