i am on astroberry. much more straightforward to set up all the dependencies. but i reckon you would be fine setting it up on raspbian if you followed all the steps:
wget -O - https://www.astroberry.io/repo/key | sudo apt-key add -
sudo su -c "echo 'deb https://www.astroberry.io/repo/ buster main' > /etc/apt/sources.list.d/astroberry.list"
sudo apt update
sudo apt upgrade
sudo apt install astroberry-server-full
My remote PC is on ubuntu 20.04. (i hate the concept of software for money - especially considering all the degradation on performance with usage and "spyware". ironic since i am a software/hardware engineer by day)
Also i donot use the astroberry hotspot but get the rpi to connect to the home network.
i am running a diy hardware for tracking and triggering my old nikon d7000, which does not have bulb mode, which requires me to set up parms prior to starting indi. so i donot use indi-web. i ssh into the rpi4, run the application to control my fpga over SPI and run:
indiserver indi_eqmod_telescope indi_nikon_cc indi_sv305_ccd
in the remote machine, i start kstar (v3.4.3), set it as remote, provide IP, select the drivers, i.e. Nikon DSLR, EqMod Mount, and SV350 CCD. Guiding as PHD2 and set the ip.
finally, open a browser, go to <IP_PI4>/desktop, login and start phd2.
EDIT: Just tested the indi-web-manager from my browser, and it works flawlessly too. after i start my diy software bits. considering i am runing modified indi_eqmod and indi_nikon, i am surprised