No, a travel authorization will not grant you entry into Laos. An immigration official will make the ultimate judgment on entrance into Laos upon arrival at the border.
A travel authorization is a document that permits you to visit Laos without the need for a visa. However, it remains at the discretion of immigration officers. If an immigration officer considers you pose a security risk or do not satisfy Laos' entrance rules, you may be denied entry even if you have travel permission.
Here are some things you may do to improve your chances of getting travel permission to enter Laos:
It's important to note that visa policies and requirements can change over time, so it's advisable to check with the Embassy or Consulate of Laos or consult with Global Visa Services for the most up-to-date and accurate information regarding transit visa requirements, application procedures, and any specific conditions that may apply to Sri Lankan citizens transiting through Laos. They will be able to provide the most current and detailed information based on the latest visa regulations.