You will find below a list of support pages to assist you with accessing your account depending on the platform you are using:

1. Steam

• Steam Account Issues Articles: https://support.steampowered.com/kb_cat.php?id=84
• Steam support: https://help.steampowered.com/en/

2. Epic Games

• Epic account support: https://www.epicgames.com/help/en-US/epic-accounts-c74
• Epic Games support: https://www.epicgames.com/help/en-US/

3. PlayStation

• PST Account Management https://support.playstation.com/s/account-management?language=en_US
• PSN support: https://support.playstation.com/s/?language=en_US

4. Xbox

• Xbox account support: https://support.xbox.com/help/account-profile/browse 
• Xbox support: https://support.xbox.com/

5. Nintendo

• Nintendo account support:  https://en-americas-support.nintendo.com/app/categories/detail/p/992/c/495
• Nintendo support: https://support.nintendo.com/