I will upload tonight and keep my fingers cross
Same here only received Mclaren Senna and should have received all the loyalty rewards, let hope this is fixed
I played FM7 a few days ago, I haven’t received the loyalty reward for FM7
AUS region, Series X, VIP etc etc
Played every Forza M and H on release except Apex and FnF, and all but FM1 are associated with my gamertag (didn’t have XBL on the original Xbox), but only got the Senna (despite FM7 being currently installed and I played it only a couple of days ago). Haven’t tried a hard reset yet but I’ve had issues with not getting all Loyalty rewards before so not holding out much hope. Minor thing at the end of the day and not going to bother submitting a ticket or anything (especially since they’re all in the Autoshow so no unicorns) but just thought I’d add my 2cents to the mix.
at first only got the senna, after quiting and starting again got the huracan,centenario and gt,Still missing the viper, P1 and GT2 RS
US Region, Windows 11 PC, Game Pass Edition with Premium Add-ons
Only received McLaren Senna from FH4 but played all Forza games with my Gamertag. Ticket submitted.
Add me to the “only Senna” Club 
I played all the other forza games exluding Forza horizon 1
I got everything I was supposed to get, never played FH4 or 2 so didnt get hose cars but otherwisse all there
Played them all & at Tier 13, did not get a single one.
Region: USA
Platform: Xbox Series X
Edition: game pass plus Premium Add on
After shutting down and restarting a few times on the Series X, I only got the Senna to show up.
So started up my Xbox One X, downloaded game and after starting up the game I got 5 more to pop.
After driving around a bit to give it save time I closed game shut down the One X & started the Series X again
making sure game was not in quick resume, I started game and it synced up with everything.
So now only missing the P1.
Region: UK
Platform: Xbox Series S
Edition: game pass plus Premium Add on
Received the Senna, nothing else. Played all previous games.
Region: Australia (Oceania)
Platform: PC (Microsoft Store)
Game edition: Game Pass + Premium Add-on Bundle
Forza History on this Gamertag: literally all of them
Loyalty cars received in FH5: McLaren Senna only
Region: Canada
Platform PC (Steam)
Game Edition: Ultimate Edition
Only received the Senna, but have played the others that should give loyalty rewards.
Region: UK/Europe
Platform: Xbox Series X
Game: Game Pass + Premium Addons bundle
Only got the Senna, should have received all of them (except the known bug one).
Region: Germany
Platform: Series X
Edition: Premium
Only got the Senna but should have gotten all the cars.
Same for me… only got the Senna instead of all cars
Region: Italy
Platform: Series X
Edition: Premium
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Same for me, i’ve played every Forza Motorsport and Horizon but i’ve received only the McLaren Senna… 
Region: USA , Midwest
Platform: Series X
Edition: Premium
GT: VerrucktSchakal
Same issue, only rewarded the Senna , but as my level 13 shows, I should have received all pertinent rewards.
Thank you.
Region: UK
Platform: Xbox One X
Edition: Premium
GT: ChubbiestGuide4
Only rewarded the Senna despite playing every Forza game released