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To the best of my recollection, the PLAY:1s can’t be used as surrounds for the Arc. Try setting up your system without the surrounds. You should be able to bond the Sub gen 4 with your Arc.
If memory serves, the min spec on the Arc for surrounds is the Sonos One, or higher.
I just peeked at your profile which indicates that you have a Play:5 (Gen1). That speaker isn’t compatible with the Arc nor the Sub 4. If your Sonos previously only consisted of the Play:1’s and Play:5 (Gen 1) then the Play:1’s must have been downgraded to S1 compatibility to match the Play:5 (Gen 1). At this juncture to make the Play:1’s compatible with the Arc you’ll need to factory reset them to make them S2 compatible with the Arc. If you still want to use the Play:5 (Gen1) you’ll need to setup a separate system for it.