Since August 2015 Erdmann has been serving as Ambassador of the Federal Republic of Germany in Turkey. During his time in office, Turkey's Foreign Ministry summoned him in March 2016 over a satirical broadcast by German television station NDR that featured a two-minute satirical song mocking Turkish President Recep Tayyip Erdoğan. In March 2017, the foreign ministry summoned him again after the municipality of Gaggenau in southwestern Germany revoked permission for a campaign event for that year's constitutional referendum at which Turkish Justice Minister Bekir Bozdağ was to appear.