Welcome to the Community. I can share some information about the bank error 106 in QuickBooks Online.
You usually encounter banking error 106 when QuickBooks is unable to find the account on your bank. To isolate the problem, I recommend logging into your bank's website to check if the account is still available.
For more information, as well as how to fix other bank errors in QuickBooks, I recommend the following article:
Hello asha_kanta_sharma, looks like you've posted the same question. I've shared details about error 103 when trying to connect an account from the Banking page. You can click this link to review the information I've provided and ways on how to get rid of this error.
Please know that you can always post here in the Community. I'm always here whenever you need assistance. Take care always.
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