Don't think that SSO is a magic solution for all of this. I'd say SSO won't work with any of it. SSO will work for new integrations but typically a team and team members will need passwords or API keys or tokens (all of these are strings, in effect passwords), and for that, beyond SSO, I have used and can recommend, for many teams in large organisations:
- A secrets manager (e.g. AWS Secrets manager) with an API key for each team, and the team can access their secrets on a team level there
- An encrypted file encrypted with e.g. KeePass, and one password for that
- Bitwarden or Lastpass on a team or department level (yes, shared passwords, for example where there is one password for one proxy)
I read a book from 1960 about Quantum Mechanics. There is more content from one paragraph there than from anything from your AppleTV, your Facebook, your WhatsApp, your Telegram or anything else from your stupid overpriced trash media. Ken Thompson is right when he calls Apple an atrocity. Linux and Framasoft are not terrorist organisations but I'm not sure about any other.
- A secrets manager (e.g. AWS Secrets manager) with an API key for each team, and the team can access their secrets on a team level there
- An encrypted file encrypted with e.g. KeePass, and one password for that
- Bitwarden or Lastpass on a team or department level (yes, shared passwords, for example where there is one password for one proxy)
- Yopass https://yopass.se/