The Volvo Parts Webstores are pretty okay if you know what you are looking for.
Volvo Parts & Accessories - Official Volvo Parts Online Store
IPD is a good one, lots of OE things, mass made custom things like skidplates, and other goodies as well. P3 (your cars generation/platform) parts arewell stocked on their site. You can also get kits (engine mounts, oil changes, etc.)
IPD Kit Builder - Genuine, OE, OES, OEM And Aftermarket Online Volvo Car Parts Catalog.
FCP Euro is good. To me, they same as IPD with some differences (no custom parts), they have their Lifetime Replacement Guarantee, where basically you can return everything and get new parts and consumables (this includes oil lol)
FCP Euro Lifetime Auto Parts Replacement Guarantee | FCP Euro.
Tasca is another option but ill be honest, I have heard mixed reviews of their site and services, but that doesn't mean that they are bad. They do have somewhat of a lower price for OE parts compared to the Volvo Parts Webstore
Volvo Models | TascaParts.com
As for your issue with your hose, I might be able to help you find the part for it if you want to shoot me a PM or message me on Discord (my link and ID is in my Signature)
I hope this helps!
Charlie