We also didn’t get a jumpwire in the box. And it’s sold out online. Lol
I’m not surprised. It’s one of the reasons I mentioned above (in the footnote of a previous post) the apparent discrepancy between the What’s in the box section of the Duo Cam Doorbell product page and what’s listed in the Make sure you have these in the box section of the Installation Guide.
For something like that, I’d be inclined to open a Support ticket. They might be able to send you the wire (which Wyze’s documentation sometimes calls the “Fuse Wire”), or at the very least they should be able to provide some guidance about what you should’ve actually received with the product and possibly pass along the query to correct the Help Center article(s) or product page or both.
I’ve never seen the wire itself available for sale on Wyze’s site as a separate product, so I’m not sure how you determined that it’s sold out. Since my only Wyze doorbell product is the Video Doorbell v2 that includes the Chime Controller, I haven’t ever had to deal with the jump/fuse wire and don’t know anything about its specifications, so I wouldn’t know what to suggest as a possible substitute if you wanted something like that in the circuit but couldn’t get it directly from Wyze.
My understanding of the wired configuration for Duo Cam Doorbell is that the home’s low-voltage AC wiring provides something akin to a constant trickle charge to the battery but that the battery is what actually powers the doorbell (because the doorbell won’t actually function without the battery in place). Given that, I think it’s reasonable to think that a fuse might not be necessary and that the battery and charging electronics would provide some buffer/protection to the doorbell camera unit, so I’d be inclined to just remove the FRONT and TRANS wires from their respective terminals in the chime box, nut them together, and call it a day. I’d expect that to make the phantom ding-dongs go away, because that’s just taking the chime entirely out of the circuit, as I suggested above.
It isn’t ‘just’ the jumpwire, It’s a wiring replacement kit for 4.99. Under replacement parts.
I’ve had the doorbell pro and gave that one to my kids when I bought the duo.
I dislike that the chime isn’t a wifi extender, like the chime with the pro.
The pro had no issue being wired to the home wiring, never once making the chime go off. And I never had to install or rewire the home chime. I took some advice and just wire-nut(ted) the 2 wires inside the chime box and my doorbell is trickle charging without annoyingly setting off the chime now. I think this ought to be sent out from Wyze. If you have NO INTENTION of using the home chime, Just detach wires inside chime box and connect them with a wire-nut.
Ah, yeah, I see the Mount Kit Replacement now. Thanks for that.
Oh, yeah, that seems familiar. 
It could definitely be included in a relevant Help Center article. As I’ve said (more than once) before, their communication and documentation often seem lacking.
I ended up disconnecting the FRONT and TRANS wires from my mechanical doorbell and just twisting them together - no jump wire, no fuse. Problem solved, I will never hear my mechanical doorbell again, so hoping the Wyze Chime is reliable.
As for the issue itself, I’m even more convinced the Wyze Duo Doorbell is simply crashing and restarting multiple times a day. The crash seems to usually be related to a movement event, but maybe not always. I know that just restarting the doorbell in the Wyze app caused my mechanical doorbell to ding, so I think this is ‘normal’ anytime the doorbell reboots. I run my Wyze Duo in 'continuous record mode to a 256GB microSDXC card. I’ve also noticed that when the issue occurs, there is a gap in the continuous recording. This also seems to point to a possible reboot.