Error Description- SMS not Matched with DLT Template.

There will be two reasons for this error:

1. The SMS content passed by you in MSG91 API does not match the approved DLT Content Template.

2. You are passing more than 30 characters in a single variable.

Note: Special Characters, Spaces, Enters, Full Stop, Comma are ignored on DLT platform, so:

1. These can be added to the content, even if they are not there in approved template.

2. These can be removed from the approved template and SMS will still be delivered.

Key Points about variables in your Template-

Characters passed in a single VARIABLE should be strictly less than or equal to 30 characters; in case you need to pass more than 30 characters apply multiple VARIABLES with spaces; ex- {#var#} {#var#} {#var#}.
Character count identifier: https://www.charactercountonline.com/
To pass a URL of more than 30 characters in your message content, you should apply multiple VARIABLES without space, to allow more characters; ex- {#var#}{#var#}{#var#}.

Shorten your URL to avoid these error chances: https://msg91.com/help/how-to-use-and-check-report-of-short-url
On DLT, the standard format of a VARIABLE is {#var#} and not ##var##; in case you have applied wrongly, kindly re-apply the Template again.