And also I need add something, when I try to open the new device alert in the connection alerts section, I get the error "Details could not be saved." I've been trying to turn off growth since yesterday, and I also reset my network, but it didn't work. The X73-DSL probably needs a firmware update.

I have the same issue, I think you have the same configuraiton the x73-DSL is needed to be the main device according to the TP-Link documentation, and mine is in the "DSL Modem Router (Default)" mode (under advanced/operation mode), with 3 Deco x60's 2 hard wired backhall one Wifi.

Firmware status is uptodate as follows:
Deco X73-DSL FW: 1.0.10 Build 20230810 Rel. 50395
Deco X60 (x3) FW: 1.2.4 Build 20230601 Rel. 37750
With this there is no iOT network, please help.

Did you have any luck with this? I am facing the same issue. I have 3 x X50 Decos that were showing an IoT wifi network when connected to the Telstra modem. I have since purchased the X73-DSL and now I cannot active the IoT wifi!?!

Like you, I have mine setup as "DSL Modem Router" as this is required to provide the internet for the network.

  @omrkdglu 

None of the DSL Decos will support IoT and other features like VPN and client conneciton preference until they get a firmware upgrade which I am begining to think will never happen.

I have an X20-DSL and it's been nearly a year since those features made it to the regular X20 but I can't use them as my X20-DSL is the main Deco. Very frustrating.

  @omrkdglu this is so frustrating!  You would think if the X50 Deco did IoT network then at $350 X73-DSL would!  Great work  TP-Link.

I just spent 4hrs removing and re-adding all my smart home devices to my network.  Not how I thought this was going to go.