Tried as shown :But got the same error:

az ad app show --id 1e7bxxx7830

existing_urls=$(az ad app show --id 1e7b8fxxxx830 --query "[web.redirectUris]")

az ad app update --id 1e7xxx0a7830 --web-redirect-uris "$existing_urls https://hostname.com/newCallback"

$updated_urls="$existing_urls https://hostname.com/newCallback"

az ad app update --id 1e7b8xxx0a7830  --set "web.redirectUris='$updated_urls'"

az ad app update --id 1e7b8fxxxd0a7830  --set "web.redirectUris='$updated_urls'"

Error:

Couldn't find 'web' in ''. Available options: []

Following command worked foe me in azure cli in updating multiple Redirect Urls:

az ad app update --id '1e7bxxxa7830' --web-redirect-uris "https://hostname.com/callback" "https://jwt.ms" "https://myexampleapp.com"

here –id is clientId .

So give the command with required urls as
az ad app update –id ‘1e7bxxxa7830’ –web-redirect-uris “<url1>” “<url2>” “<url3>“

upon az ad app show --id 1e7b8xxxx830

I also wanted to automate this as part of the DevOps pipeline so got this working with the following bash script:

#!/bin/bash
new_uri="<your_new_redirect_uri>" # or take from parameter with $1
client_id="<your_client_id>"

# Get string array of existing redirect URIs
existing_redirect_uris=$(az ad app show --id $client_id --query "[web.redirectUris]" --output tsv)
echo $existing_redirect_uris

# Check if the new URI is already in the list
if [[ $existing_redirect_uris == *$new_uri* ]]; then
    echo "The URI $new_uri is already in the list"
else
    echo "Adding the URI $new_uri to the list"
    az ad app update --id $client_id --web-redirect-uris $existing_redirect_uris $new_uri
fi

And other script to remove redirect URI from the list:

#!/bin/bash
remove_uri="<remove_redirect_uri>" # or take from parameter with $1
client_id="<your_client_id>"

# Get list of existing redirect URIs and already remove selected with sed from that list
remaining_redirect_uris=$(az ad app show --id $client_id --query "[web.redirectUris]" --output tsv | sed "s|$remove_uri||g")
echo $remaining_redirect_uris
az ad app update --id $client_id --web-redirect-uris $remaining_redirect_uris