The visitors from the capital started well, and disrupted Bayern's build-up work in the early stages.
While predecessor Wagner could count on a seven-week-long preparation phase, only two weeks remain for Baum to get the team back on track, when Schalke faces Union Berlin on October 18 on home soil in the Bundesliga.
The AFA said Udinese goalkeeper Juan Musso had also been cut from the squad because of a knee injury suffered while training on Monday.
Chaux, 28, replaces Napoli keeper David Ospina, who was barred from traveling after two players from the Italian club tested positive for coronavirus, the Colombian Football Federation (FCF) said on Monday.
After the restart, Dortmund started where it left off and doubled the lead two minutes into the second half as Reyna's pinpoint corner kick found Emre Can, who nodded home the ball over Muller.
Sevilla presented their last two signings of the summer with Karim Rekik and Oussama Idrissi joining Julen Lopetegui's side, who once again look to have worked well in the transfer market, despite failing to sign Real Sociedad's Willian Jose.
FC Barcelona have had a promising start to the campaign under new coach Ronald Koeman, scoring seven goals in their opening two matches, with the midfield pairing of Sergio Busquets and Frenkie de Jong giving a solid base for the attacking quarter of Ansu Fati, Leo Messi, Philippe Coutinho and Antoine Griezmann.
Despite the return of the veteran duo, Colombia's squad also features a number of fresh faces, including uncapped Hertha Berlin striker John Cordoba and America de Cali goalkeeper Eder Chaux.
However, the 35-year-old Kipchoge was dropped from the leading pack with about three kilometers to go, finishing eighth at last.
Alkasir was also fined 10,000 U.S. dollars, it said.
"Scoring goals gives us confidence. It is a great victory," said PSG head coach Thomas Tuchel.