Are you sure about VLAN tag 101? The information I can find would be VLAN tag 7, if vodafone relies on Telekom infrastructure underneath - and VLAN tag 132 if they own the cables themselves.
Another issue seems to be "Line Mode: G.993.2 (VDSL2)" combined with "Data Rate: 15.471 Mb/s / 1.119 Mb/s", this looks an awful lot like you'd be using a non-vectoring fallback profile on a connection that would require a vectoring capable modem. Keep in mind that OpenWrt is only allowed to ship non-vectoring enabled xDSL firmware blobs, if you do want a vectoring enabled one, you do have supply a firmware file with vectoring support yourself.
Additionally to the advice from @slh regarding the VLAN tag - Vodafone has also different prefixes depending on your contract. To add insult to injury, the username written to you might not be the one you need.
Back when i was using them, i had to use the "arcor.komplet/abxxxxx" prefix, but there are also "vodafone.komplett/xxxxxxxxx" around. So this might also need additional trial-and error from your side.
Do the Lan Ports 3+4, which only support 100 Mbit/s, work for you? I have a Fritz!Box 7262 SL 1&1 branded.
If I try to apply vlan config on them, there's a good chance the device freezes. It recognizes the connections as gigabit although my Zyxel switch says it's only 100. And the ports are dead on layer 2 and higher levels. Packages don't go through.
Perhaps give a current OpenWrt/ master snapshot a try, lantiq has moved to DSA there, which re-shuffles the cards (won't help 21.02.x by itself, but it would be interesting to evaluate the current status for the next release after it).
I've tried latest master (a1939e7e37) and it's the same as 21.02. Link is flapping, but for a moment while it's up, ping is working and the data counters in OpenWrt increase. I can't find anything obvious in commits besides removing some extra drivers, but it still doesn't work if I re-enable them in menuconfig.
I would now be interested to know what happens next here. I can also confirm that the 7362 with the current openwrt v21 does not support all 4 ports. With the v19 it works now again with all 4 Ports. But on the info page about the device 7326 there is nothing noticed about this restriction. Can I contribute something to have a progress here?
It's possible that phy support was broken early on . I would recommend build some test images before those changes on vr9.dtsi
|2021-06-26|Martin Blumenstingl|lantiq: xrx200: switch the subtarget to the mainline DSA driver
|2021-04-12|Mathias Kresin|lantiq: dts: mark PCI bridges as such
|2021-04-03|Joachim Cerny|lantiq: VR9: fix gpio-hog by defining the GPIO ranges
|2021-02-28|Mathias Kresin|lantiq: vr9: set the usb led trigger via devicetree |2020-10-19|Adrian Schmutzler|lantiq: remove support for kernel 4.19
|2020-03-16|Mathias Kresin|lantiq: copy target to kernel 5.4
I've seen no reports from 7360 or 7362 owners in recent polls . I own FB 7412
but seen 7360 for equivalent of ~12eur in my country